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<a name="boost.interprocess.xsi_shared_memory"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class xsi_shared_memory</span></h2>
<p>boost::interprocess::xsi_shared_memory</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_interprocess_reference.html#header.boost.interprocess.xsi_shared_memory_hpp" title="Header &lt;boost/interprocess/xsi_shared_memory.hpp&gt;">boost/interprocess/xsi_shared_memory.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="xsi_shared_memory.html#boost.interprocess.xsi_shared_memoryconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="xsi_shared_memory.html#idp57532416-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57533120-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57534288-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> 
                    <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57536992-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> 
                    <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57539728-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57541072-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  xsi_shared_memory&amp; <a class="link" href="xsi_shared_memory.html#idp57541984-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="xsi_shared_memory.html#idp57542880-bb"><span class="special">~</span><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="xsi_shared_memory.html#idp57529616-bb">public member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="xsi_shared_memory.html#idp57529824-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="xsi_shared_memory.html#idp57530960-bb"><span class="identifier">get_shmid</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">mapping_handle_t</span> <a class="link" href="xsi_shared_memory.html#idp57531680-bb"><span class="identifier">get_mapping_handle</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="xsi_shared_memory.html#idp57543264-bb">public static functions</a></span>
  <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="xsi_shared_memory.html#idp57543472-bb"><span class="identifier">remove</span></a><span class="special">(</span><span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp81389008"></a><h2>Description</h2>
<p>A class that wraps XSI (System V) shared memory. Unlike <a class="link" href="shared_memory_object.html" title="Class shared_memory_object">shared_memory_object</a>, <a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> needs a valid <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> to identify a shared memory object.</p>
<p>Warning: XSI shared memory and interprocess portable shared memory (<a class="link" href="shared_memory_object.html" title="Class shared_memory_object">boost::interprocess::shared_memory_object</a>) can't communicate between them. </p>
<div class="refsect2">
<a name="idp81391616"></a><h3>
<a name="boost.interprocess.xsi_shared_memoryconstruct-copy-destruct"></a><code class="computeroutput">xsi_shared_memory</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idp57532416-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Default constructor. Represents an empty <code class="computeroutput"><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a></code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57533120-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">int</span> shmid<span class="special">)</span><span class="special">;</span></pre>
<p>Initializes *this with a shmid previously obtained (possibly from another process) This lower-level initializer allows shared memory mapping without having a key. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57534288-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">,</span> 
                  <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new XSI shared memory from 'key', with size "size" and permissions "perm". If the shared memory previously exists, throws an error. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57536992-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">,</span> 
                  <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<p>Opens an existing shared memory with identifier 'key' or creates a new XSI shared memory from identifier 'key', with size "size" and permissions "perm". </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57539728-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">)</span><span class="special">;</span></pre>
<p>Tries to open a XSI shared memory with identifier 'key' If the shared memory does not previously exist, it throws an error. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57541072-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span> moved<span class="special">)</span><span class="special">;</span></pre>
<p>Moves the ownership of "moved"'s shared memory object to *this. After the call, "moved" does not represent any shared memory object. Does not throw </p>
</li>
<li class="listitem">
<pre class="literallayout">xsi_shared_memory&amp; <a name="idp57541984-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span> moved<span class="special">)</span><span class="special">;</span></pre>
<p>Moves the ownership of "moved"'s shared memory to *this. After the call, "moved" does not represent any shared memory. Does not throw </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp57542880-bb"></a><span class="special">~</span><span class="identifier">xsi_shared_memory</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Destroys *this. The shared memory won't be destroyed, just this connection to it. Use remove() to destroy the shared memory. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp81426144"></a><h3>
<a name="idp57529616-bb"></a><code class="computeroutput">xsi_shared_memory</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp57529824-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span> other<span class="special">)</span><span class="special">;</span></pre>Swaps two xsi_shared_memorys. Does not throw. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">int</span> <a name="idp57530960-bb"></a><span class="identifier">get_shmid</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the shared memory ID that identifies the shared memory </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">mapping_handle_t</span> <a name="idp57531680-bb"></a><span class="identifier">get_mapping_handle</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the mapping handle. Never throws </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp81435472"></a><h3>
<a name="idp57543264-bb"></a><code class="computeroutput">xsi_shared_memory</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp57543472-bb"></a><span class="identifier">remove</span><span class="special">(</span><span class="keyword">int</span> shmid<span class="special">)</span><span class="special">;</span></pre>
<p>Erases the XSI shared memory object identified by shmid from the system. Returns false on error. Never throws </p>
</li></ol></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2005-2012 Ion Gaztanaga<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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